<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>forEachObject</title>
</head>

<body>
    <div>打开浏览器控制台查看结果</div>
    <script>
        const forEachObject = (obj, callback) => {
            Object.keys(obj).forEach(key => callback(obj[key], key));
        };
        const obj = {
            a: 1,
            b: 2
        };
        forEachObject(obj, (value, key) => console.log(value, key)); // 1,a b,2
    </script>
</body>

</html>